Guide buffer device for drill-pipe conveyed logging instrument

Abstract

The invention discloses a guide buffer device for a drill-pipe conveyed logging instrument. The guide buffer device comprises a connector, a fixing device, a core rod, a buffer device and a guide device, the fixing device comprises a shell and a fixing ring mounted at one end of the shell, the connector is mounted at the other end of the shell, the rear end of the core rod penetrates the fixing ring and is placed in a cavity of the shell, a projection is arranged in the middle of the core rod and positioned in the cavity of the shell and contacts with the fixing ring, the guide device is mounted at the front end of the core rod, the buffer device comprises a spring I, a spring II, a rubber component and a base plate, the spring I is mounted at the rear end of the core rod, contacts with one side of the projection and is positioned in the cavity of the shell, the spring II is mounted at the front end of the core rod and contacts with the fixing ring, the rubber component is mounted on the inner side of the cavity of the shell, and the base plate is positioned between the rubber component and the spring I. The action time of impact force in high-speed collision of the instrument and a stratum can be prolonged, damage to the instrument due to secondary oscillation generated by rigid collision of the core rod and the connector is avoided, and the problem of easy breakage of a rubber cone can be improved.

Description

technical field [0001] The invention relates to the field of petroleum well logging, in particular to a guiding and buffering device for a drill pipe conveying type logging instrument. Background technique [0002] Drill pipe transport logging is to place the logging instrument inside the drill pipe. When logging, the instrument first goes down to the bottom of the well with the drill pipe, then starts the mud pump to pump the instrument out of the drill pipe, and finally goes up Lift the drill pipe for logging; when pumping out, the instrument rushes out of the drill pipe and stops after hitting the formation. Due to the high pressure of the mud pump, the instrument will receive a large impact force during the impact process, which may easily cause damage to the sensitive components in the logging instrument. Therefore, the guide buffer is generally used to buffer the instrument. [0003] The application number is 201220714849.1, which discloses a buffer nipple, which incl...

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Problems solved by technology

[0004] The present invention aims to overcome the problems in the prior art that the secondary vibration caused by the rigid collision between the buffer shaft and the connecting body causes damage to the instrument and the buffer rubber cone breaks, and provides a guiding buffer device for a drill pipe conveying type logging instrument

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